Oven.



No. @$9,695. v 'Patented May l5, |900..

J. JACUBSN & G. JORANSONI. i

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(Application Bled Jan. 81, 1900.)

(No Modal.)

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JACOB JAUOBSON AND GUSTAF JORANSON, OF OlllOAGO, llJNOlS.

OVEN.

SPECIFICATION forming part of Letters Patent No. 649,695, dated May 15,1900.

Application filed January 31,1900. Serial No, 3,542. (No model) To all1071/0711/ t may concern:

13e it known that we, JACOB JACOBSON and GUsTAF JonANsoN, citizens ofthe United States, residing at Chicago, in the county of Cook and Stateof Illinois, have invented a new and useful Improvement in Ovens, ofwhich the following is a specification.

Our invention relates to that class of ovens or driers in which thematerial to be baked or dried is moved through the oven by mechanical orother means. Heretofore it has been impossible or very difficult toobtain the heat at a given temperature on the upper side of the materialto be baked, and when the heat is forced down from above by a current ofair a large percentage of the heat is necessarily lost.

Ve construct our oven so that the heat is directed toward the materialto be baked or dried from above as well as below, and this we accomplishwithout the use of a current of air, which necessarily cools the oven toa certain extent.. Ve also arrange the burners for heating the oven sothat each burner, whether it is located in the upper or lower side,front, or rear end of the oven, can be regulated independently of theothers. The burners used are of any ordinary construction. W'e preferusing gas, it being the most convenient to handle. XVe place within anoven of sufficient length, whose ends are closed with the exception of aslot large enough to permit the passage therethrough of the material tobe baked upon a moving perforated belt made of any incombustiblematerial, two rows of hollow metallic rollers arranged one above theother, so that the belt carrying the material to be baked can passbetween the two rows of rollers. One end of every roller is open, intowhich is admitted the flame from the burner, and by causing the rollersto be rotated we attain the desired effect of having all sides of therollers of equal temperature. Thus it will be readily understood that byregulating the heat passing within any roller the heat radiating fromthat roller will be regulated, whether it be in the upper or lower row.

Referring to the drawings, in which similar numerals refer to similarparts in all the views, Figure 1 is a side elevation of our improvedoven, partly in section. Fig. 2 is a fragmental plan view, and Fig. osection on line 3 3 of Fig. 1.

Secured upon the supports 5, which are braced by the cross-pieces 6, arethe longitudinal channel-irons 7, to which are secured the journal-boxes8 for the lower rollers 9 and the journal-boxes 10 for the upper roll,Mers 11. One end of the rollers 9 and 11 is open, as at 12, communicatingwith the hollow interior 13 of the rollers.

Arranged adjacent to the open ends 12 of the rollers are the gas-pipes14E, having communicating with them the burners 15, one of which isplaced in the open end 12 of cach roller 9 and 11. The other end of therollers 9 and 11 carries a short shaft, to which is secured asprocket-wheel 16, which are all engaged by the endless chain 17, asshown.

Fastened at convenient intervals on the inner face of the channel-irons7 are the carrying-brackets 18, over which slide the chains 19, securedto either side of the endless perforated belt 20, passing over thedriven roller 21 at the outlet end of the oven and the idlerroller 22 atthe inlet end of the oven, re turning beneath the oven, where we convenniently place the gravity-belt tighteners 23. Ve place at intervals thecross-bars 2a be tween the chains 19 to prevent the chains coming tooclose together, and thereby slipping off of the carrying-brackets 18.

Mounted upon the shaft 25 of the driven roller 21 is the sprocket-wheel26, driven by a counter-shaft through the chain 27. Secured to one ofthe shafts on the rollers 11, adjacent to the sprocket-wheel 1G, is thesprocket-wheel 2S, driven by the chain 29. Inolosing the rollers 9 and11 and itting tightly around the journal-boxes 8 and 10 is a crossweconstruct the oven-casing 30, having the openings 31 on either end topermit the passage of the endless belt 2O and the material to be bakedor dried. Ve prefer making this oven-casing of sheet metal, lined withsome i IOO sprocket-chain arranged in two horizontal rows in ahorizontalplane, and an endless belt for carrying the material to bebaked or dried, we do not wish to be limited to this eXact construction,but we may construct the oven with slight modification and still liewithin the scope of our invention.

Having described our invention, what we claim, and desire to secure byLetters Patent, 1s-

l. The combination in a baking-oven of a series of hollow rollers,having one closed end and one open end, internally heated by introducinga ame into the open end thereof arranged above and below an endlesscarrier, but not in contact therewith, a means for rotatingthe rollerssimultaneously and a means for driving the said belt, all arrangedwithin a casing, substantially as and for the purpose specified.

2. In a baking-oven, the combination of a series of rotatable cylinders,the heads of as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

JACOB JACOBSON.. GUSTAF JORANSON.

Witnesses:

J. D. CHUBE, J. C. DAvIDsoN.

